<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="cate-container">
      <!-- 左侧的滚动视图 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{height : wh + 'px'}">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item' , i===active ? 'active' : '']" @click="changeActive(i)">
            {{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <!-- 右侧的滚动视图-->
      <scroll-view class="right-scroll-view" scroll-y :style="{height : wh +'px'}" :scroll-top="scrollTop">
        <view class="right-scroll-view-list" v-for="(item2, i2) in cateList2" :key="i2">
          <!-- title-->
          <view class="right-scroll-view-item-title">
            /{{item2.cat_name}}/
          </view>
          <!-- 三级目录-->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- image-->
              <image class="cate-lv3-item-image" :src="item3.cat_icon"></image>
              <!-- name-->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>

        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        wh: 0,
        cateList: [],
        cateList2: [],
        active: 0,
        scrollTop: 0
      };
    },
    onLoad() {
      /* 获取系统信息*/
      const info = uni.getSystemInfoSync();
      // console.log(info)
      this.wh = info.windowHeight - 50;

      this.getCateLists()
    },
    methods: {
      async getCateLists() {
        const {
          data: res
        } =
        await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status !== 200) {
          return uni.$showMsg()
        }
        this.cateList2 = res.message[0].children
        this.cateList = res.message
      },
      changeActive(i) {
        this.active = i
        this.cateList2 = this.cateList[i].children
        this.scrollTop = Math.random()
      },
      gotoGoodsList(item3){
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }

    }
  }
</script>

<style lang="scss">
  .cate-container {
    display: flex;

    .left-scroll-view {
      width: 120rpx;

      .left-scroll-view-item {
        line-height: 60rpx;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;

        &.active {
          background-color: #ffffff;
          position: relative;

          &::before {
            content: ' ';
            display: block;
            width: 3rpx;
            height: 30rpx;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }


      }
    }

    .right-scroll-view {

      .right-scroll-view-list {
        .right-scroll-view-item-title {
          text-align: center;
          font-size: 12px;
          font-weight: bold;
          padding: 15px 0;
        }

        .cate-lv3-list {
          display: flex;
          flex-wrap: wrap;

          .cate-lv3-item {
            width: 33.33%;
            margin-bottom: 10px;
            display: flex;
            flex-direction: column;
            align-items: center;

            .cate-lv3-item-image {
              width: 60px;
              height: 60px;
            }

            text {
              font-size: 12px;
            }
          }
        }
      }
    }
  }
</style>
